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How to "Pin" Content to Bottom of Popup Window

Hello,

I have a popup window that is divided into three sections: header, body, and footer. I would like to "pin" the footer to the bottom of the window, but am having difficulty. I have created a test page here:

Positioning the footer at the bottom with CSS is a good idea, but will only work if the content never exceeds the innerHeight of the window minus the height of the footer. DHTML is needed for the logic you've described.